@reactivex/rxjs
Version:
Reactive Extensions for modern JavaScript
49 lines • 1.99 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var switchMap_1 = require("./switchMap");
/* tslint:enable:max-line-length */
/**
* Projects each source value to the same Observable which is flattened multiple
* times with {@link switchMap} in the output Observable.
*
* <span class="informal">It's like {@link switchMap}, but maps each value
* always to the same inner Observable.</span>
*
* 
*
* Maps each source value to the given Observable `innerObservable` regardless
* of the source value, and then flattens those resulting Observables into one
* single Observable, which is the output Observable. The output Observables
* emits values only from the most recently emitted instance of
* `innerObservable`.
*
* ## Example
* Rerun an interval Observable on every click event
* ```ts
* import { fromEvent, interval } from 'rxjs';
* import { switchMapTo } from 'rxjs/operators';
*
* const clicks = fromEvent(document, 'click');
* const result = clicks.pipe(switchMapTo(interval(1000)));
* result.subscribe(x => console.log(x));
* ```
*
* @see {@link concatMapTo}
* @see {@link switchAll}
* @see {@link switchMap}
* @see {@link mergeMapTo}
*
* @param {ObservableInput} innerObservable An Observable to replace each value from
* the source Observable.
* @return {Observable} An Observable that emits items from the given
* `innerObservable` (and optionally transformed through the deprecated `resultSelector`)
* every time a value is emitted on the source Observable, and taking only the values
* from the most recently projected inner Observable.
* @method switchMapTo
* @owner Observable
*/
function switchMapTo(innerObservable, resultSelector) {
return resultSelector ? switchMap_1.switchMap(function () { return innerObservable; }, resultSelector) : switchMap_1.switchMap(function () { return innerObservable; });
}
exports.switchMapTo = switchMapTo;
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